Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..113f&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 113-118. Research supported by the Research Corp. and Robert A. Welc
Astronomy and Astrophysics
Astronomy
12
Formaldehyde, Galactic Nuclei, Infrared Astronomy, Interstellar Extinction, Interstellar Matter, Carbon Monoxide, Infrared Spectra, Line Spectra, Molecular Clouds, Star Clusters
Scientific paper
H2CO absorption observations against Sgr A are used to select the molecular material lying in front of the galactic center, and an analysis similar to that of Blitz and Shu (1980) is carried out. The ratio of visual extinction to equivalent width of the 6 cm line of H2CO is found to be similar for several nearby interstellar clouds. By considering only the molecular components in front of the infrared cluster, the estimate for the extinction is decreased to 15-46 mag. These results are consistent with those from infrared observations toward the galactic center. Extinction estimates based on other interstellar species are also considered. Atomic gas is seen as contributing less than 10 mag of extinction.
Evans Neal J. II
Federman Steven Robert
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